Improvement in hollow augers



UNITED STATES PATENT OEEICE.

CORNELIUS L. CAMPBELL, OF BINGHAMTON, NEW YORK.

IMPROVEMENT IN HOLLOW AUGERS.

Specification forming part of Letters Patent No. 42,639, dated May 10, 1864.

To all whoml it may concern:

Be it known that I, C. L. CAMPBELL, of Binghamton, in the county of Broome, n the State of New York, have invented a certain new and useful Improvement in Hollow Augers; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specifcation, in which- Figure l represents a side view of my improved auger as 'used in making a tenen on a wagon spoke; Fig. 2, a view ofthe under side thereof; Fig. 3, a view of the top of the same, and Fig. 4 a top view with the lever B removed. A

Similar letters of reference in the several views indicate. corresponding parts.

The object of this invention is to produce a hollow auger which can be readily adjusted by' hand to'any desired size of the tenori required to be made without the use ot a wrench or adjusting-screws.

A hollow tube, P, with the end tapered off to fit into a hit stock, is attached to a frame, A, into which is fitted slides s s, as shown in the several figures iuthe drawings. The knives or bits K K are let into the slides, s s, so that the lower or under surfaces are iush with the under surface of the sl'des7 and are held in place by the cross-pieces c c.

The inner ends of the slides s s are made concave, and the points ot' the knives project a short distance beyond the curvature thereof.

For the purpose of adjusting the slides or knives to any desired size I have provided the lever B, made to tit around the hollow tube P so as to turn upon it as an axis. Each end of the lever B is provided with a pin, M', made to fit into corresponding grooves b b let into the slides s s. These grooves are placed diagonally across the slides, so that by moving the lever B one way or the other the slides are moved outwardly or inwardly. An arm, m, extends from one end of the lever, provided with a slot, o, for the purpose of adjusting the slides to any'required distance, and through this slot, passes the clampscrew p, which i'astens into the frame A.

The openings a a in the slides s s are for the purpose of giving outlet to the shavings. 'lhe edges ot the lever yB are beveled, as at h h and d, to give more room for the shavings or borings.

By means of the lever B and the clampscrewp, the knives or bits y7c lc may be set so as to make a tenon of any desired size.

What I claim as my invention, and desire to secure by Letters Patent, is-l The arrangement ofthe slides s s and knives or bits lc It', operated and adjusted by the lever B and clamp screw p, in combination with the frame A and tube P, as and for the purposes sct forth.

CORNELIUS L. CAMPBELL. Witnesses THEo. FnANKs, GEO. W. SMITH. 

